Page 2 7/2/18 Name 10. Which of the following is not a strong acid? a. H CO b. H
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Page 2 7/2/18 Name 10. Which of the following is not a strong acid? a. H CO b. HNO C.HCT d. HI 11. An enzyme a. is a protein b. increases the rate of a reaction c. is a catalyst d. all of the above 12. A piece of potato placed in a beaker of distilled water increases in weight. This occurs because the interior of the potato isto the distilled water. a. hypertonic b. hypotonic c. isotonic d. metatonic 13. Roman soldiers were paid in PERIODI a gold b. paper d. salt i4. Oxygen gas is less soluble in warm water and fish die near power plants since their processes warm the water in vicinity. This is an example of ?.global warming b.thermal pollution c.Tyndall effed dGreenhuse effect 15. Osmosis is the a. diffusion of water across a semipermeable membrane b. movement of ions and small molecules across a semipermeable membrane c. shrinkage of a blood cell when placed in distilled water d. dissolving of a greater amount of solid solute at higher temperatures 16. which of the following does?exhibit the Tydll effect? a suspension b. colloid c solution d. all do 17. Which solution will have the highest boiling point? a 0.2 M NaCI b. 0.2 M CaCl, c02 M glucose d.0.3M NH 18. In dialysis, which toxic ion is removed from the blood? a. chloride b. potassiumcammonium all The procedure commonly used to determine the concentration of an acid in a solution by adding a measured volume of base is called 19. a. equivalence point b. molarity cdistillation .titrationExplanation / Answer
10. a. H2CO3 is a weak acid.
Nitric acid , hydrochloric acid and Hydroiodic acids are all strong acids.
11. d. all of the above
An enzyme is a biological catalyst which increases the rate of a reaction without being used up. Enzymes are also proteins that are folded into complex shapes that allow smaller molecules to fit into them. The place where these substrate molecules fit is called the active site.
12. a. hypertonic
The potato slice placed in distilled water, which is a high concentration of almost pure water, definitely higher than that which the potato's cells contain. This solution is referred to as hypotonic. The water will diffuse into the cells of the potato, causing them to swell; the cells may be characterized as being "turgid", or swollen.
13. d. salt
Roman soldiers were paid in salt. It is from the same source that the word salary comes from. Salt was very scarce and an expensive commodity then.
14. b. thermal pollution
Solubility decreases with increase in temperature.
15. a. diffusion of water across a semipermeable membrane
The movement of ions and molecules across a semipermeable membrane is called Passive transport
16. c. solution
Tyndall effect is the scattering of light when a beam of light passes through a colloid or a suspension. A solution however does not show Tyndall effect as the particles of a solution are not large enough o scatter light.
17. b. 0.2M CaCl2
Delta T= i Kb m, Kb is a constant
So Delta T proportional to i m
i= 2 , for NaCl
i=3 for CaCl2
i= 1 for glucose and ammonia
18. d. all
19. d. titration.
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